Otto Braun (1872–1955) was a German politician and Prime Minister of Prussia.
Otto Braun may also refer to: Otto Braun (poet) (1897–1918), German poet Otto Braun (communist) (1900–1974), German communist journalist and Comintern agent Otto Philipp Braun (1798–1869), German-born Bolivian military officer and politician Otto Philipp Braun (journalist) (1824–1900), German editor and translator